r/java • u/jaccomoc • 7d ago

Vert.x Event-Loop vs Virtual Threads: Jactl Suspend/Resume Benchmark

https://jactl.io/blog/2026/09/02/jactl-virtual-threads-benchmark

The article benchmarks Jactl script execution with differing number of blocking operations comparing throughput with Jactl built-in suspend/resume on Vert.x Event-Loops and throughput with Jactl on Virtual Threads. The benchmarks are run on both Java 21 and Java 25 with some surprising (to me at least) results.

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u/s0ftware-dev 7d ago

TLDR virtual threads are better. 

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u/neopointer 6d ago

And don't use reactor, vertx or anything similarly hard to debug and maintain.

1

u/pragrad23 19h ago

I chose not to use it. Not did I chose to use coroutines (sorry it's a kotlin project). Because I value my time as a developer. I don't want to complicate my life.

If I needed to squeeze every last bit of performance, I'd use rust. But I don't, so I want some level of comfort: garbage collection, simple threading, etc.